Solve day 19 part 2
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c31d6e53c2
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DAF7821E067D9C48
4 changed files with 146 additions and 45 deletions
6
.vscode/settings.json
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6
.vscode/settings.json
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@ -0,0 +1,6 @@
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{
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"files.associations": {
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"typeindex": "c",
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"typeinfo": "c"
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}
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}
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103
Day19/Day19A.c
103
Day19/Day19A.c
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@ -40,50 +40,57 @@ int instruction_read(Instruction *i, FILE *file) {
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return 0;
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}
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void instruction_execute(const Instruction *i, uint32_t *r, uint32_t *ip, uint32_t *ip_r) {
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if (*ip_r != -1)
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r[*ip_r] = *ip;
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void instruction_execute(const Instruction* instructions, uint32_t* r, uint32_t* ip_r) {
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const Instruction i = instructions[r[*ip_r]];
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switch (i->opcode) {
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#ifdef DEBUG
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const char *name = names[i.opcode];
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printf(
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"ip=%2u [%10u, %10u, %10u, %10u, %10u, %10u] %4s %2u %2u %2u ",
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r[*ip_r], r[0], r[1], r[2], r[3], r[4], r[5], name, i.a, i.b, i.c
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);
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#endif
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switch (i.opcode) {
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// Addition
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case ADDR: r[i->c] = r[i->a] + r[i->b]; break;
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case ADDI: r[i->c] = r[i->a] + i->b; break;
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case ADDR: r[i.c] = r[i.a] + r[i.b]; break;
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case ADDI: r[i.c] = r[i.a] + i.b; break;
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// Multiplication
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case MULR: r[i->c] = r[i->a] * r[i->b]; break;
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case MULI: r[i->c] = r[i->a] * i->b; break;
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case MULR: r[i.c] = r[i.a] * r[i.b]; break;
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case MULI: r[i.c] = r[i.a] * i.b; break;
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// Bitwise AND
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case BANR: r[i->c] = (r[i->a] & r[i->b]); break;
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case BANI: r[i->c] = (r[i->a] & i->b); break;
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case BANR: r[i.c] = (r[i.a] & r[i.b]); break;
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case BANI: r[i.c] = (r[i.a] & i.b); break;
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// Bitwise OR
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case BORR: r[i->c] = (r[i->a] | r[i->b]); break;
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case BORI: r[i->c] = (r[i->a] | i->b); break;
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case BORR: r[i.c] = (r[i.a] | r[i.b]); break;
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case BORI: r[i.c] = (r[i.a] | i.b); break;
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// Assignment
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case SETR: r[i->c] = r[i->a]; break;
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case SETI: r[i->c] = i->a; break;
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case SETR: r[i.c] = r[i.a]; break;
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case SETI: r[i.c] = i.a; break;
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// Greater-than testing
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case GTIR: r[i->c] = (i->a > r[i->b]); break;
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case GTRI: r[i->c] = (r[i->a] > i->b); break;
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case GTRR: r[i->c] = (r[i->a] > r[i->b]); break;
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case GTIR: r[i.c] = (i.a > r[i.b]); break;
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case GTRI: r[i.c] = (r[i.a] > i.b); break;
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case GTRR: r[i.c] = (r[i.a] > r[i.b]); break;
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// Equality testing
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case EQIR: r[i->c] = (i->a == r[i->b]); break;
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case EQRI: r[i->c] = (r[i->a] == i->b); break;
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case EQRR: r[i->c] = (r[i->a] == r[i->b]); break;
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case IP: *ip_r = i->a; *ip -= 1; break;
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case EQIR: r[i.c] = (i.a == r[i.b]); break;
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case EQRI: r[i.c] = (r[i.a] == i.b); break;
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case EQRR: r[i.c] = (r[i.a] == r[i.b]); break;
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default: assert(0);
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}
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if (*ip_r != -1)
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*ip = r[*ip_r];
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#ifdef DEBUG
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printf("[%10u, %10u, %10u, %10u, %10u, %10u]\r", r[0], r[1], r[2], r[3], r[4], r[5]);
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#endif
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getchar();
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*ip += 1;
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r[*ip_r] += 1;
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}
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int main(int argc, char **argv) {
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@ -94,35 +101,41 @@ int main(int argc, char **argv) {
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FILE *file = fopen(argv[1], "r");
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uint32_t registers[6] = {0};
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uint32_t ip_reg = -1;
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#ifdef DEBUG
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puts("=================");
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puts(" READING INPUT");
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puts("=================");
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#endif
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uint32_t registers[6] = {1, 0};
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uint32_t ip_reg = 0;
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size_t instr_count = 0;
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for (instr_count = 0; instr_count < 1024 && instruction_read(&instructions[instr_count], file); instr_count++) {
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#ifdef DEBUG
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printf("opcode: %2d (%s), a: %d, b: %d, c: %d\n", instructions[instr_count].opcode,
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names[instructions[instr_count].opcode], instructions[instr_count].a, instructions[instr_count].b,
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instructions[instr_count].c);
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#endif
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}
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for (uint32_t i = 0; i < instr_count;) {
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Instruction instruction = instructions[i];
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#ifdef DEBUG
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const char *name = names[instruction.opcode];
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printf("opcode: %2d (%s), a: %d, b: %d, c: %d\n", instruction.opcode,
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name, instruction.a, instruction.b, instruction.c);
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#endif
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instruction_execute(&instruction, registers, &i, &ip_reg);
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const Instruction instr = instructions[instr_count];
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if (instr.opcode == IP) {
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// Assuming that an #ip can only occur once here
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ip_reg = instr.a;
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instr_count -= 1;
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}
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#ifdef DEBUG
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printf("registers: %d %d %d %d %d %d\n", registers[0], registers[1],
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registers[2], registers[3], registers[4], registers[5]);
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printf("opcode: %2d (%s), a: %d, b: %d, c: %d\n", instr.opcode, names[instr.opcode], instr.a, instr.b, instr.c);
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#endif
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}
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fclose(file);
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#ifdef DEBUG
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puts("");
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puts("=======================");
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puts(" STARTING SIMULATION");
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puts("=======================");
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#endif
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while (registers[ip_reg] < instr_count) {
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instruction_execute(instructions, registers, &ip_reg);
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}
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printf("%d\n", registers[0]);
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return EXIT_SUCCESS;
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}
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71
Day19/reverse.txt
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71
Day19/reverse.txt
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@ -0,0 +1,71 @@
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r5 += 16;
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r1 += 2;
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r1 *= r1;
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r1 = r5 * r1;
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r1 *= 11;
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r4 += 7;
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r4 = r4 * r5;
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r4 += 20;
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r1 += r4;
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r5 += r0;
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r4 = r5;
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r4 = r4 * r5;
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r4 = r5 * r4;
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r4 = r5 * r4;
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r4 = r4 * 14;
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r4 = r4 * r5;
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r1 += r4;
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r0 = 0;
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r5 = 0;
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int R0 = 0;
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int R1 = 10551410;
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for (int R3 = 1; R3 <= R1; R3++) {
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for (int R2 = 1; R2 <= R1; R2++) {
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if (R3 * R2 == R1)
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R0 += R3
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}
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}
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printf("%d", R0);
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┌──────── 0 addi ip 16 ip
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┌───│───────> 1 seti 1 0 3 ; R3 = 1
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│ ┌─│───────> 2 seti 1 2 2 ; R2 = 1
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│ │ │ ┌─────> 3 mulr 3 2 4 ; R4 = R3 * R2
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│ │ │ │ 4 eqrr 4 1 4 ; ⎫
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│ │ │ │ ┌─? 5 addr 4 ip ip ; ⎬ if (R4 == R1)
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│ │ │ │ ┌─│── 6 addi ip 1 ip ; │ R0 += R3
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│ │ │ │ │ └─> 7 addr 3 0 0 ; ⎭
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│ │ │ │ └───> 8 addi 2 1 2 ; R2 += 1
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│ │ │ │ 9 gtrr 2 1 4 ; ⎫
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│ │ │ │ ┌─? 10 addr ip 4 ip ; ⎬ if (R2 > R1)
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│ │ │ └───│── 11 seti 2 7 ip ; ⎭ break;
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│ │ │ └─> 12 addi 3 1 3 ; R3 += 1
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│ │ │ 13 gtrr 3 1 4 ; ⎫ if (R3 > R1)
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│ │ │ ┌─? 14 addr 4 ip ip ; ⎬ exit;
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│ └─│─────│── 15 seti 1 3 ip ; │ else
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│ │ └─╳ 16 mulr ip ip ip ; ⎭ continue;
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│ └───────> 17 addi 1 2 1 ; ⎫
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│ 18 mulr 1 1 1 ; │
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│ 19 mulr ip 1 1 ; ⎬ R1 = (R1 + 2)^2 * 11
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│ 20 muli 1 11 1 ; ⎭
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│ 21 addi 4 7 4 ; ⎫
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│ 22 mulr 4 ip 4 ; ⎬ R4 = (R4 + 7) * 22 + 20
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│ 23 addi 4 20 4 ; ⎭
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│ 24 addr 1 4 1 ; R1 += R4
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│ ┌── 25 addr ip 0 ip ; IP += 1 (given in assignment)
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├─────────│── 26 seti 0 4 ip
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│ └─> 27 setr ip 9 4 ; ⎫
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│ 28 mulr 4 ip 4 ; │
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│ 29 addr ip 4 4 ; │
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│ 30 mulr ip 4 4 ; ⎬ R4 = 10550400 (constant)
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│ 31 muli 4 14 4 ; │
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│ 32 mulr 4 ip 4 ; ⎭
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│ 33 addr 1 4 1 ; R1 = 10550400 + R1
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│ 34 seti 0 2 0 ; R0 = 0
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└──────────── 35 seti 0 ip ip ; IP = 0
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R0 = 0 --> [ 0, 1010, 0, 0, 174, 0]
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R0 = 1 --> [ 0, 10551410, 0, 0, 10550400, 0]
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11
Day19/reversed.c
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11
Day19/reversed.c
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#include <stdio.h>
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#include <stdint.h>
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int main() {
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uint64_t result = 0;
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uint64_t target = 10551410;
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for (uint64_t i = 1; i <= target; i++) {
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if (target % i == 0)
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result += target / i;
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}
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printf("%d\n", result);
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}
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